unproven
adj. B2 Upper Intermediate US //ənˈpɹuvən// UK //ʌnpɹˈuːvən// un·proven
adj. not having been shown to be true or correct yet. You use this to describe a theory or a medicine that has not been tested enough to be certain.
adj. not having been established as true or valid through evidence or testing. Often used to describe scientific hypotheses or medical treatments that lack sufficient empirical support.
The new medicine is still unproven.
Scientists are testing the theory, but it remains unproven until more data is collected.
While the initial results were promising, the treatment remains unproven and is currently only available to patients participating in a controlled clinical trial.
From un- + proven.